Organization and Summary of Significant Accounting Policies - Additional Information (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2022 USD ($) Properties Property State Community shares	Jun. 30, 2021 shares	Dec. 31, 2024 Property	Dec. 31, 2023 Property	Dec. 31, 2022 Property	Dec. 31, 2021 USD ($) shares
Real Estate Properties [Line Items]
General Partners' Capital Account, Units Outstanding | shares	115,438,832	114,919,922
Number of Real Estate Properties | Community	290
Development and capital improvements in progress	$ 267,691					$ 247,970
Number of States in which Entity Operates | State	16
Consolidated assets	$ 11,280,401					11,285,182
Consolidated liabilities	5,089,882					5,101,090
Real Estate Investments, Joint Ventures	$ 31,700
Percentage Of Rental Revenue From Leasing Of Apartment Homes	94.00%
Percentage Of Reimbursable Revenue From Leasing Of Apartment Homes	5.00%
Percentage of Rental Revenue and Other Income From Non-leasing Activities	1.00%
Operating Lease, Right-of-Use Asset	$ 45,900					47,000
Right-of-use Lease, Liability	29,528					30,300
Marketable equity securities	$ 9,800
Operating lease weighted average remaining lease term	32 years
Operating lease weighted average discount rate	4.40%
Other Assets [Member]
Real Estate Properties [Line Items]
Real Estate Investments, Joint Ventures	$ 44,600					79,400
Real Estate [Member]
Real Estate Properties [Line Items]
Cash proceeds	43,100
Real Estate [Member] | Post Massachusetts Avenue [Member]
Real Estate Properties [Line Items]
Real Estate Investments, Joint Ventures	$ 42,500					$ 42,800
Maximum [Member] | Accounting Standards Update 2016-02 [Member]
Real Estate Properties [Line Items]
Operating lease, term of contract	1 year
Development Properties [Member]
Real Estate Properties [Line Items]
Number of Real Estate Properties | Community	5
Number of units under development community | Properties	1,759
Development Properties [Member] | Expected Costs
Real Estate Properties [Line Items]
Development and capital improvements in progress	$ 444,000
Development Properties [Member] | Scenario Forecast [Member]
Real Estate Properties [Line Items]
Number of Real Estate Properties | Property			1	3	1
Retail
Real Estate Properties [Line Items]
Number of Real Estate Properties | Property	33
M A A L P
Real Estate Properties [Line Items]
Limited Liability Company (LLC) or Limited Partnership (LP), Managing Member or General Partner, Ownership Interest	97.30%	96.90%
Limited Partnership [Member]
Real Estate Properties [Line Items]
General Partners' Capital Account, Units Outstanding | shares	115,438,832					115,336,876
Number of Real Estate Properties | Property	1
Development and capital improvements in progress	$ 267,691					$ 247,970
Consolidated assets	11,280,401					11,285,182
Consolidated liabilities	5,089,901					5,101,109
Limited Partnership [Member] | Real Estate [Member] | Variable Interest Entity Primary Beneficiary [Member]
Real Estate Properties [Line Items]
Consolidated assets	218,500					252,800
Consolidated liabilities	$ 14,700					$ 15,900
Limited Partnership [Member] | Minimum [Member]
Real Estate Properties [Line Items]
Percentage of ownership interests of all consolidated subsidiaries (percent)	80.00%
Limited Partnership [Member] | Maximum [Member]
Real Estate Properties [Line Items]
Percentage of ownership interests of all consolidated subsidiaries (percent)	100.00%
Limited Partnership [Member] | Development Properties [Member] | Costs Incurred To Date
Real Estate Properties [Line Items]
Development and capital improvements in progress	$ 230,400